I got this idea from Makers Manual but my design fits the popular mini-round hygrometers found on Amazon and does not require any supports.
Just detach the original lid off the top of your storage container and pop this one on.
https://www.amazon.com/dp/B0CMH5BZG1?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1
The cereal boxes I use are also from Amazon:
https://www.amazon.com/dp/B0B75QF7XM?ref=ppx_yo2ov_dt_b_fed_asin_title
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